JP3104116U - Power transmission mechanism for bicycles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving force transmission mechanism for a bicycle in which gravity is converted into a dynamic driving force to reduce an output condition of a necessary driving force, thereby reducing physical labor and making traveling of the bicycle easier.
A driven member (20) disposed at the center of a rear wheel (61) of a bicycle and having an internal gear tooth surface (21) meshes with and engages with the internal gear tooth surface (21) of the driven member (20). A driving member 30 having an external gear 31 defining the external gear 31 and carrying the full weight and full load of gravity of the bicycle. A gravitational synergistic transmission wheel structure is formed, which functions as a main driving force supply source, and the driving member 30 meshed with the driven member 20 is rotated forward and upward, so that the external gear 31 is driven by the driven member. In addition to moving along the internal gear tooth surface 21 of the gear 20 to generate a forward and upward force, the driving force due to the gravitational force applied to the drive member 30 causes the drive member 30 to quickly move down the internal gear tooth surface 21 for the gear. To drive the driven member 20 Creating a synergistic rotation of the timber 30, thereby by efficiently converting gravity into dynamic driving force, and configured to reduce the output condition of the required driving force.
[Selection diagram] FIG.

Description

  The present invention relates to a driving force transmission mechanism for driving a bicycle. More specifically, the present invention effectively converts the weight of the full weight and full load of the bicycle into a dynamic driving force, and reduces the required driving force of the bicycle. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmission mechanism for a bicycle in which output conditions are reduced to reduce physical labor during traveling of the bicycle so that the bicycle can travel easily.

FIG. 1 is a side view of a main part showing only a rear wheel portion of a conventional bicycle 10.
This conventional bicycle 10 is used for transmitting a driving force to a rear wheel 11 and a flywheel 12 installed on one side of a central portion of a rear wheel 11 connected to a large gear disc (not shown). And a chain belt 13. When actually used for traveling, the flywheel 12 must rotate in synchronization with the rotation of the rear wheel 11, which inevitably doubles the output condition of the driving force required for traveling of the bicycle, Running on the bicycle 10 requires a great deal of effort.

  According to the present invention, a driven member which is disposed at the center of the rear wheel of the bicycle and has an internal gear tooth surface meshes with and engages with the internal gear tooth surface of the driven member to define an outer periphery. A drive member having external gears, the drive member carrying the full weight and full load of gravity of the bicycle is eccentrically positioned on the driven member to form an offset gravity synergistic transmission wheel structure, A first object is to provide a driving force transmission mechanism for a bicycle that functions as a main driving force supply source.

  According to the present invention, further, a limiting unit having a damping spring is disposed on a side surface of the driven member, so that when the driving force of the driving member is attenuated, the internal force for the gear of the driven member is reduced by gravity applied to the driving member. The second object of the present invention is to provide a driving force transmission mechanism for a bicycle in which a restriction shaft of a restriction unit is raised as a result of descending along a tooth surface to compress a damping spring, thereby effectively achieving a shock absorbing effect. The purpose of.

  A driving force transmission mechanism for a bicycle according to claim 1 of the present invention is disposed at a center portion of a rear wheel of a bicycle and has a driven member having an internal gear tooth surface, and a gear internal tooth surface of the driven member. A driving member having an external gear that meshes with and engages with the outer periphery of the driven member, and the driving member carrying the full weight and full load of gravity of the bicycle is positioned at an eccentric position of the driven member. It is arranged and forms an offset gravity synergistic transmission wheel structure to function as a main driving force supply source of the bicycle, and the driving member meshed with the driven member is rotated forward and upward to move the outer side. The tooth gear moves along the internal gear tooth surface of the driven member to produce a forward and upward force, and the gravitational force applied to the drive member quickly urges the internal gear tooth surface downward. Then, the driven member rotates relative to the driving member, thereby reducing the gravity. By effectively converted into driving force, to reduce the output conditions of the required driving force, characterized in that so as to ease the travel of the bicycle.

  According to a second aspect of the present invention, in the power transmission mechanism for a bicycle according to the first aspect, a large-diameter stepped annular seat is formed on each of both side surfaces of the internal gear tooth surface of the driven member, and the pair of interlocking members are provided. Are respectively held.

  According to a third aspect of the present invention, in the power transmission mechanism for a bicycle according to the first aspect, the drive member is provided with a shaft, and male threads are formed at both end portions of the shaft, and a flywheel is formed. The upper fork and the lower fork of the rear wheel of the bicycle are fixed to the flywheel.

  According to a fourth aspect of the present invention, in the power transmission mechanism for a bicycle according to the second aspect, the pair of interlocking members have disk portions respectively mounted on both sides of the annular seat of the driven member, and have an outer peripheral surface thereof. A second bearing having a through hole through which a shaft of a driving member is inserted is formed at a predetermined position deviated from a central portion of the disk portion. On the other side with a pair of engagement holes through which both ends of the restriction shaft of the restriction unit are inserted, and a pair of fixing holes for connecting the disk parts are symmetrically arranged. I do.

  According to a fifth aspect of the present invention, in the power transmission mechanism for a bicycle according to the fourth aspect, the limiting shaft of the limiting unit is inserted through an engaging hole 43 formed in a disk portion of each of the interlocking members, and projects therefrom. A turning hole is formed in each of the two end portions in a vertical direction perpendicular to the axial direction, and one end of a turning rod equipped with a damping spring is formed in each of the turning holes in an upper side surface of the rear wheel. And the damping spring is disposed between a nut and a retaining nut screwed into an external thread formed on the outer surface of one end of the revolving rod, and is provided at the other end of the revolving rod 53. Is characterized in that a hollow connecting tube to which a positioning shaft is attached is formed.

  According to a sixth aspect of the present invention, in the power transmission mechanism for a bicycle according to the fifth aspect, the positioning shaft of the limit unit is installed in advance on a rear wheel upper fork of the bicycle.

    Since the present invention has the above-described configuration, the driving member carrying the gravitational force of the full weight and full load of the bicycle rotates forward and upward in the gear mechanism to effectively move the gravitational force applied to the driving member. By rotating the driven member in cooperation with the driving force of the pedal, the output condition of the required driving force of the bicycle is reduced, and the physical labor when riding the bicycle is reduced. You can run easily.

  In addition, since the limit shaft that moves together with the drive member regulates the range of rotation of the drive member when the drive member moves up and down, it is possible to prevent the gravitational synergistic transmission effect of the drive member from being lost.

  Hereinafter, preferred embodiments of a driving force transmission mechanism for a bicycle according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is an exploded perspective view of a rear wheel portion showing an embodiment of a driving force transmission mechanism for a bicycle according to the present invention, and FIG. 3 is an enlarged cross-sectional view of a main part of the driving force transmission mechanism after completion of the present invention. FIG. 4 is a partially cutaway view showing the driving force transmission mechanism disposed inside the flywheel of the bicycle. FIG. 5 is a schematic view showing the use state of the driving member of the present invention, and FIG. 6 is a schematic diagram showing the driving member and the limiting unit of the present invention. This shows an operation state in which the unit is lowered.
As shown in FIG. 2, the driving force transmission mechanism for a bicycle according to the present invention includes a driven member 20, a driving member 30, an interlocking member 40, and a limiting unit 50.

  The driven member 20 has a hollow tube shape, and is fixed to the center of the rear wheel 61B of the bicycle 60 by a number of spokes 61B extending from a rear wheel inner peripheral surface rim 61A. Further, an internal gear tooth surface 21 is formed on the inner peripheral surface, and an annular seat having a step portion having a large diameter is formed on both side surfaces of the internal gear tooth surface 21.

  The driving member 30 has an external gear 31 whose outer periphery is limited to an annular shape, and a shaft 32. At both ends of the shaft, a male screw portion 321 is formed to protrude, and An offset gravity synergistic gear mechanism, which is disposed at a position deviated from the internal gear tooth surface 21 formed on the entire inner peripheral surface of the member 20 and meshes only with a certain range of the internal gear tooth surface 21, moves up and down. Constitute.

  A pair of similar interlocking members 40 arranged on both sides of the driven member 20 have disk portions 40a fitted on both sides of the annular seat 22 of the driven member 20, and the outer peripheral surface thereof has A second bearing 421 having a through hole 42 is formed at a predetermined position where the first bearing 41 is eccentric from the center of the disk portion 40a.

  On the other side of the second bearing 421 across the center, engagement holes 43 are symmetrically arranged. Further, a pair of fixing holes 44 for connecting the disk portions 40a, 40a to each other are symmetrically arranged on the disk portion 40a of each of the interlocking members 40, and a screw 441 is provided in these fixing holes 44. By tightening, the two interlocking members 40 are mutually connected.

The configuration of the limiting unit 50 is as follows.
The restricting shaft 51 is inserted into an engaging hole 43 formed in the disk portion 40a of each of the interlocking members 40, and a turning hole 511 is formed through each of the protruding ends in a vertical direction perpendicular to the axial direction. One end of a turning rod 53 on which a damping spring 52 is mounted is inserted into each turning hole 51 from above the side surface of the rear wheel 61. An external thread portion 532 to which a nut 533 and a retaining nut 534 are screwed is formed on the outer surface of one end of the turning rod 53, and after the turning rod 53 is inserted into the turning hole 511, This allows mutual alignment and mounting. Further, a hollow connecting tube 531 is provided at the other end of the revolving rod 53, and a positioning shaft 54 is attached thereto. The positioning shaft 54 is formed at both ends with a small diameter connection support portion 541 having a female screw hole 542 formed at the center portion. The connection support portions 541 at both ends are inserted into the connection tube 531. , And screwed together to complete the assembly of the limiting unit 50.

Next, the assembly of the driving force transmission mechanism for a bicycle according to the present invention will be described with reference to FIGS.
First, the driven member 20 is fixed to the center of the rear wheel 61 by a number of spokes 61B extending from the rear wheel inner peripheral surface rim 61A of the rear wheel 61 of the bicycle 60. Next, the driving member 30 is installed at a bias position shifted from the center below the inner surface of the driven member 20 so that the external tooth surface 31 of the driving member 30 meshes with the gear internal tooth surface 21. Furthermore, two interlocking members 40 are installed from both sides with the driven member 20 interposed therebetween, and the two interlocking members 40 are aligned with the through holes 42 between the second bearings 421 formed in the disk portions 40a of the interlocking members 40 so as to match the shaft 32. The interlocking member 40 is fitted until the first bearing 41 of the interlocking member 40 engages with the annular seat 22 of the driven member 20, and the fixing hole 44 of each interlocking member 40 is fixed using two screws 441. And fixed to the interlocking member 40 with the fixing nut 441a, and integrated with the rear wheel 61.

  Next, the flywheel 63 driven by the chain belt 62 is arranged on one side of the driving member 30, and the fork formed on the lower end of the lower fork 65 of the rear wheel 61 and the upper fork 64 of the rear wheel 61 of the bicycle 60. After the shafts 32 formed on both sides of the drive member 30 are inserted into the mounting holes 66, fixing nuts (not shown) are screwed and fixed to the male screw portions 321 formed on both ends of the shaft 32, respectively. The drive member 30 is connected and fixed to the upper and lower forks 64 and 65.

  Accordingly, the driving member 30 is provided with the gravitational force of the full weight of the bicycle 60 via the upper and lower forks 64 and 65 and is displaced to the biased position in the driven member 20. A gravitational synergy transmission wheel structure is formed.

  Further, both ends of the restriction shaft 51 are slidably inserted into the engagement holes 43 of the respective interlocking members 40 so that the turning holes 511 of the restriction shaft 51 project outward from the outside of the interlocking members 40. I do. Then, the damping springs 52 are fitted to the respective turning rods 53 and come into contact with the nuts 533 arranged above the damping rods 53. Next, the turning rod 53 is moved from the top to the bottom to pass through the turning hole 511 of the restriction shaft 51, and then the retaining nut 534 is fitted to the lower part of the male screw portion 532 and fixed appropriately.

  Then, as shown in FIG. 5, the positioning shaft 54 is set and mounted in advance on the upper portion of the rear wheel upper fork portion 64, and the connecting tubes 531 of the respective turning rods 53 are respectively connected to the positioning shaft 54. Are engaged with the connecting columns 541 formed at both ends of the frame, are aligned with each other, and are screwed and fixed in the female screw holes 542 to complete the assembly of the present invention.

Next, the operation of the driving force transmission mechanism for a bicycle according to the present invention will be described with reference to FIGS.
When the large-diameter gear disc 67 is rotated by the bicycle pedal and the chain belt 65 is moved, the flywheel 63 of the rear wheel 61 is driven and biased. The shaft 32 of the drive member 30 is driven to rotate synchronously with the biased flywheel 63, and the external tooth surface 31 of the drive member 30 is engaged with the internal gear tooth surface 21 of the driven member 20 and moves. A force is generated that moves the wheel 61 forward and moves the wheel 61 above the internal gear tooth surface 21.

  Due to the offset gear mechanism in which the driving member is disposed at a biased position deviated from the center of the driven member 20, the driving member 30 carrying the weight and the load gravity of the bicycle 60 is connected to the chain due to the rotation of the bicycle pedal. As a result of moving the gear internal tooth surface 21 forward and vertically by a synergistic effect with the driving force of the belt 65, a relative rotational motion of the driven member 20 is generated, thereby effectively converting gravity into a dynamic driving force. By converting, the output condition of the required driving force of the bicycle can be reduced, and the bicycle can be run easily.

  As shown in FIG. 6, when the driving member 30 speeds up during the rotational movement and the driving force is increased, the external tooth surface 31 of the driving member 30 is moved forward and upward by the gear mechanism, and the driven member is moved. The center of gravity 20 is relatively moved forward and downward, and automatically rotates the rear wheel 61, whereby the bicycle 60 can be moved forward.

  On the other hand, the upper and lower forks 64 and 65 of the rear wheel 61 lifted upward together with the drive member 30 slightly lift the rear wheel bracket of the bicycle 60. As a result, the restricting shafts 51 of the restricting units 50 arranged on both sides of the driven member 20 descend along the turning rod 53 through the turning holes 511, and perform a linear motion opposite to the driving member 30. To produce. Then, the first bearing 41 of the interlocking member 40 urged by the rotation of the driving member 30 and the restriction shaft 51 smoothly rotates along the annular seat of the driven member 20. When the driving member 30 and the restriction shaft 51 move and the driving member 30 moves up to the respective restriction positions and the restriction shaft 51 descends, the restriction shaft 51 is moved by the restriction nut 534 engaged with the bottom portion. By stopping the upward movement of the 30 and the offset gravity synergistic gear movement due to gravity, a limiting effect is achieved, and the driving member 30 is reliably prevented from moving to the opposite side on the center line of the disk portion 40a of the driven member 20. .

When the driving force to the driving member 30 is stopped or reduced, the external gear 31 of the driving member 30 descends along the internal gear tooth surface 21 of the driven member 20.
On the other hand, the restricting shaft 51 of the restricting unit 50 rises along the turning rod 53 via the turning hole 511 and is restricted by the damping spring 52, thereby promoting the shock absorbing effect of the bicycle 60.

  As described above, the preferred embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications and improvements may be made without departing from the scope of the claims of the present invention. It goes without saying that the present invention is encompassed in the claims.

The figure which shows the use condition of the driving force transmission mechanism of the rear wheel of the conventional bicycle. FIG. 2 is an exploded perspective view of a main part of a rear wheel portion showing an embodiment of a driving force transmission mechanism for a bicycle according to the present invention. FIG. 4 is an enlarged partial cross-sectional view of a main part of the assembled driving force transmission mechanism of the present invention. FIG. 4 is a side view of FIG. 3 showing a driving member disposed inside the flywheel of the bicycle of the present invention. FIG. 4 is a side view showing a use state of the driving member of the driving force transmission mechanism for a bicycle according to the present invention, and showing a state where the driving member is located at the bottom of the driven member. The side view which shows the operation | movement relation at the time of use of the drive member of the driving force transmission mechanism for bicycles of this invention, and a limiting unit, and shows the state in which a drive member goes up to each limitation position and a limiting unit falls.

Explanation of reference numerals

Reference Signs List 20 driven member 21 gear internal tooth surface 22 annular seat 30 driving member 31 external gear 32 shaft 321 external thread portion 40 interlocking member 41 first bearing 42 through hole 421 second bearing 43 engagement hole 50 limiting unit 51 limiting shaft 511 Revolving hole 52 Damping spring 53 Revolving rod 531 Connecting tube 532 Male screw part 533 Nut 534 Fastening nut 54 Positioning shaft 541 Connecting post part 542 Female screw hole 60 Bicycle 61 Rear wheel

Claims (6)

A driven member that is disposed at the center of the rear wheel of the bicycle and has an internal gear tooth surface, and an external gear that meshes and engages with the internal gear tooth surface of the driven member to define the outer circumference. A driving member having a gravitational force of the full weight and full load of the bicycle, the driving member being disposed at an eccentric position of the driven member to form an offset gravity synergistic transmission wheel structure, and The external gear moves along the internal gear tooth surface of the driven member by functioning as a main driving force supply source and rotating and moving the driving member meshed with the driven member forward and upward. To produce a forward and upward force, and the gravitational force applied to the drive member quickly urges the internal gear tooth surface downward, thereby causing the driven member to rotate relative to the drive member, thereby By converting gravity to dynamic driving force effectively, the required driving force can be obtained. Reducing conditions, the driving force transmission mechanism for a bicycle, characterized in that so as to ease the travel of the bicycle.   2. The bicycle according to claim 1, wherein large-diameter stepped annular seats are formed on both side surfaces of the internal gear tooth surface of the driven member to respectively hold the pair of interlocking members. Power transmission mechanism.   A shaft is provided on the drive member, male threads are formed at both ends of the shaft, and a flywheel is provided. An upper fork and a lower fork of a rear wheel of the bicycle are provided on the flywheel. The driving force transmission mechanism for a bicycle according to claim 1, wherein the driving force transmission mechanism is fixed.   The pair of interlocking members each have a disk portion mounted on both sides of the annular seat of the driven member, a first bearing on an outer peripheral surface thereof, and a predetermined position offset from a central portion of the disk portion. A second bearing having a through-hole through which the shaft of the driving member is inserted is formed, and both ends of the limiting shaft of the limiting unit are inserted into the other side of the second bearing across the center. 3. A driving force transmission mechanism for a bicycle according to claim 2, wherein a pair of fixing holes for connecting the engaging holes and the disc portions to each other are symmetrically arranged.  The restriction shaft of the restriction unit is inserted through an engagement hole formed in the disk portion of each of the interlocking members, and a turning hole penetrates through both protruding ends in a vertical direction perpendicular to the axial direction. One end of a turning rod having a damping spring mounted therein is inserted into each of the turning holes from above the side surface of the rear wheel, and the damping spring is formed on the outer surface of one end of the turning rod. A hollow connecting tube to which a positioning shaft is attached is formed at the other end of the swiveling rod. The driving force transmission mechanism for a bicycle according to claim 4, wherein   The power transmission mechanism for a bicycle according to claim 5, wherein the positioning shaft of the restriction unit is installed in advance on an upper portion of the rear wheel upper fork of the bicycle.